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Summary of August 2004 Monthly Hydrologic Conditions

Compiled in cooperation with the New Jersey Department of Environmental Protection
Provisional assessment of hydrologic conditions in New Jersey

The following pages are adapted for online release from a summary of hydrologic condions for the previous month.

August 2004

Precipitation was below normal at the Newark and Atlantic City index stations, and above normal at the Trenton index station. Newark reported 3.68 inches, which is 91.5 percent of normal. Atlantic City reported 4.14 inches, which is 95.8 percent of normal. Trenton reported 4.34 inches, which is 114 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of August 31 was 72.6 billion gallons, which is 90.3 percent of capacity. The storage was 2.35 billion gallons less than one month ago and 0.16 billion gallons less than one year ago. The thirteen major water supply reservoirs are as follows: Lake Tappan, Woodcliff Lake, Oradell Reservoir, DeForest Lake, Splitrock Reservoir, Boonton Reservoir, Canistear Reservoir, Oak Ridge Reservoir, Clinton Reservoir, Charlottesburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.

Streamflow was below normal at the High Bridge index station, and above normal at the Folsom and Trenton index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 63.0 ft³/s, 83.6 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 68.8 ft³/s, 117 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 16,020 ft³/s, 291 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on August 31 was 11,000 ft³/s.

Groundwater levels, as measured in water-table observation wells, were above normal at all three index wells. Levels decreased from last month, and were higher than one year ago at Reading School 11 and Morrell 1 index wells, and slightly lower than one year ago at the Vocational School 2 index well.

Temperature and dissolved oxygen at Delaware River at Trenton were within limits of recorded historic monthly extremes, but specific conductance reached a new record low for the month of August.

All of the files listed below are in Portable Document Format (PDF) which can be viewed/printed with the Adobe Acrobat® Reader, freely available for most computer platforms.

• Combined Storage in the 13 Major Water Supply Reservoirs
• Monthly precipitation at three selected sites
• Groundwater levels in selected Water-table observation wells
• Streamflow at selected sites
• Water quality for the Delaware River at Trenton